The quilt patch titled Subject: riscv: kexec: initialize kexec_buf struct has been removed from the -mm tree. Its filename was riscv-kexec-initialize-kexec_buf-struct.patch

This patch was dropped because it was merged into the mm-hotfixes-stable branch of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

------------------------------------------------------ From: Breno Leitao leitao@debian.org Subject: riscv: kexec: initialize kexec_buf struct Date: Wed, 27 Aug 2025 03:42:22 -0700

The kexec_buf structure was previously declared without initialization. commit bf454ec31add ("kexec_file: allow to place kexec_buf randomly") added a field that is always read but not consistently populated by all architectures. This un-initialized field will contain garbage.

This is also triggering a UBSAN warning when the uninitialized data was accessed:

------------[ cut here ]------------ UBSAN: invalid-load in ./include/linux/kexec.h:210:10 load of value 252 is not a valid value for type '_Bool'

Zero-initializing kexec_buf at declaration ensures all fields are cleanly set, preventing future instances of uninitialized memory being used.

Link: https://lkml.kernel.org/r/20250827-kbuf_all-v1-2-1df9882bb01a@debian.org Fixes: bf454ec31add ("kexec_file: allow to place kexec_buf randomly") Signed-off-by: Breno Leitao leitao@debian.org Cc: Albert Ou aou@eecs.berkeley.edu Cc: Alexander Gordeev agordeev@linux.ibm.com Cc: Alexandre Ghiti alex@ghiti.fr Cc: Baoquan He bhe@redhat.com Cc: Catalin Marinas catalin.marinas@arm.com Cc: Christian Borntraeger borntraeger@linux.ibm.com Cc: Coiby Xu coxu@redhat.com Cc: Heiko Carstens hca@linux.ibm.com Cc: Palmer Dabbelt palmer@dabbelt.com Cc: Paul Walmsley paul.walmsley@sifive.com Cc: Sven Schnelle svens@linux.ibm.com Cc: Vasily Gorbik gor@linux.ibm.com Cc: Will Deacon will@kernel.org Cc: stable@vger.kernel.org Signed-off-by: Andrew Morton akpm@linux-foundation.org ---

arch/riscv/kernel/kexec_elf.c | 4 ++-- arch/riscv/kernel/kexec_image.c | 2 +- arch/riscv/kernel/machine_kexec_file.c | 2 +- 3 files changed, 4 insertions(+), 4 deletions(-)

--- a/arch/riscv/kernel/kexec_elf.c~riscv-kexec-initialize-kexec_buf-struct +++ a/arch/riscv/kernel/kexec_elf.c @@ -28,7 +28,7 @@ static int riscv_kexec_elf_load(struct k int i; int ret = 0; size_t size; - struct kexec_buf kbuf; + struct kexec_buf kbuf = {}; const struct elf_phdr *phdr;

kbuf.image = image; @@ -66,7 +66,7 @@ static int elf_find_pbase(struct kimage { int i; int ret; - struct kexec_buf kbuf; + struct kexec_buf kbuf = {}; const struct elf_phdr *phdr; unsigned long lowest_paddr = ULONG_MAX; unsigned long lowest_vaddr = ULONG_MAX; --- a/arch/riscv/kernel/kexec_image.c~riscv-kexec-initialize-kexec_buf-struct +++ a/arch/riscv/kernel/kexec_image.c @@ -41,7 +41,7 @@ static void *image_load(struct kimage *i struct riscv_image_header *h; u64 flags; bool be_image, be_kernel; - struct kexec_buf kbuf; + struct kexec_buf kbuf = {}; int ret;

/* Check Image header */ --- a/arch/riscv/kernel/machine_kexec_file.c~riscv-kexec-initialize-kexec_buf-struct +++ a/arch/riscv/kernel/machine_kexec_file.c @@ -261,7 +261,7 @@ int load_extra_segments(struct kimage *i int ret; void *fdt; unsigned long initrd_pbase = 0UL; - struct kexec_buf kbuf; + struct kexec_buf kbuf = {}; char *modified_cmdline = NULL;

kbuf.image = image; _

Patches currently in -mm which might be from leitao@debian.org are